August 19 is the day when Dmitry Mendeleev, who climbed high with a balloon, observed the solar eclipse

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August 19 is the day when Dmitry Mendeleev, who ascended with a balloon, observed the eclipse

Dmitry Mendeleev, who ascended to the top of the balloon, observed a solar eclipse. and the shadow of the Moon falls on a certain area of ​​the Earth. There, a total solar eclipse is observed and the surroundings darken. Elsewhere, the eclipse is partially observed. There can be 2 to 5 solar eclipses a year. Because the Earth's orbits around the Sun and the Moon's orbits around the Earth are in elongated orbits, the distance between them is constantly changing. As a result, the visible diameters of the Sun and Moon are constantly changing. During a solar eclipse, if the apparent diameter of the Moon is large enough than that of the Sun, a total eclipse will occur and its maximum phase will be longer (no more than 7.5 min). If the lunar rim is smaller than the solar rim. It cannot completely block the surface of the Sun, and at this time it is observed in the sky as a thin bright ring (ring-like eclipse). As the moon moves in its orbit at a speed of 1 km per second, the shadow of the moon moves at about the same speed, but the shadow falls on the Earth, which revolves around its own axis. The direction of the Earth's rotation was also known. This is called saros. He is 18 years 11 days 8 hours.